I wonder if that's an old C Band free-to-air satellite TV dish? It sounds like it's on the large side, but it might work. Search "free to air" and you'll find the required LNB (low noise block converter) and receiver. Couple that with a small Ku-Band dish (one meter or less) and you'll have all the free-to-air your dishes can see. Check out www.lyngsat.com for lists of satellites, frequencies, and TV stations available. Big dishes give you more gain (stronger signal, was important back in the analog days, and still helps for C-Band), but bigger dishes have much smaller look angles (like a telescope versus binoculars) and are harder to aim.
I just have a one meter Ku Band dish. I recommend even smaller, to be easier to aim, unless you live really far from the equator. When I lived in northern New York the extra gain of a one meter dish helped a lot. We mostly point to the bird at 97 degrees west, and pick up about a hundred free channels. Many different languages, some good music and sometimes movies. But the only English-language channels are news and religion. If you are Chinese or Iranian, there is an excellent variety to choose from. Other satellites have more Spanish language, from what I've seen on lyngsat.
The receiver is the most expensive part, and it can be had for $100 or $200. If you want one that accepts smart cards, to descramble the pay channels, it might cost a bit more.
I added some of the detail above not for the original poster but for anyone else who might be interested.